. Concepts for drilling and excavating in and below the ocean bottom. Underwater drilling; Ocean bottom. Figure 54. Experimental model of hydraulically powered soil milling cutter and spoil removal system. During this study, a com- bined cutter—slurry removal unit with hydraulic drive was obtained and tested (Figures 54 and 55). The principal information obtained with the equipment shown in Fig- ures 54 and 55 was the lateral force necessary to force a cutter through soil. This would be a particularly important design value in developing a successful mobile excavator as recommended by Northrop
. Concepts for drilling and excavating in and below the ocean bottom. Underwater drilling; Ocean bottom. Figure 54. Experimental model of hydraulically powered soil milling cutter and spoil removal system. During this study, a com- bined cutter—slurry removal unit with hydraulic drive was obtained and tested (Figures 54 and 55). The principal information obtained with the equipment shown in Fig- ures 54 and 55 was the lateral force necessary to force a cutter through soil. This would be a particularly important design value in developing a successful mobile excavator as recommended by Northrop (1970). There are no present plans for addi- tional work in this area other than the publishing of the results of this limited but important testing. REMOTE CONTROL SYSTEMS This section is based on the earlier discussion of possible machines for excavation presented in the section "Shallow Drilling and ; Because of the high turbidity that can be expected during and for some time after earthmoving and drilling on the ocean bottom, local control of equipment will probably not be feasible. Remote control in itself does not provide the complete answer, either. Preparation of complex surfaces with trenches and holes for piling precisely formed in the surface appears far too complex for a simple remotely controlled machine such as a bull- dozer. The machine proposed for such seafloor site preparation is in essence an enlarged milling machine 68. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : Naval Civil Engineering Laboratory
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